Related by context. All words. (Click for frequent words.) 69 Ultrasonography 68 Biopsies 66 CT Scans 66 Embolization 65 needle aspiration 65 Sonography 65 Radical Prostatectomy 65 Resection 65 CT Angiography 64 excisional biopsy 64 Less Invasive 63 Single Incision 63 Intraoperative 63 transabdominal 63 Aortic Valve Replacement 63 Sentinel Lymph Node Biopsy 63 Virtual Colonoscopy 63 Bronchoscopy 63 biopsy 63 MR Angiography 63 FDG-PET/CT 63 Angiographic 63 Partial Nephrectomy 63 Sentinel Lymph Node 62 Breast Cancers 62 Prostate Biopsy 62 Cystectomy 62 Contrast Enhanced 62 biopsies 62 Nephrectomy 61 Salivary 61 Duodenal 61 Endoscopic 61 Adenomas 61 Robotic Assisted 61 Transvaginal 61 Axillary 61 Chemoradiation 61 fine needle aspiration 61 Circulating Tumor Cells 61 Esophageal 61 EBUS 61 Coronary Angiography 61 Lesion 61 Occlusion 60 Lumpectomy 60 Sonographic 60 Angiogram 60 Prostate Cancer Treatment 60 Contrast Agent 60 Breast Biopsy 60 Robot Assisted 60 core needle biopsy 60 ORLive Presents 60 Patients Undergoing 60 Carotid Artery 60 Adenoma 60 histologic examination 60 Computer Aided Detection 60 Breast Specific 60 Needle Biopsy 60 computed tomographic 60 Ureteral 60 Squamous Cell Carcinoma 60 surgical biopsy 60 Aortic Valve 60 Coronary Artery 60 Fine Needle Aspiration 60 Metastases 60 keratoplasty 60 Scintigraphy 60 Implantation 59 transesophageal echocardiography 59 Intravascular 59 Stenting 59 Ultrasensitive 59 Prostatectomy 59 D Dimer 59 Coronary Arteries 59 PET Scans 59 Aortic 59 Localized Prostate Cancer 59 Contrast Agents 59 Peripheral Arterial 59 Cystoscopy 59 Amniocentesis 59 Biliary 59 Rectal 59 Radiofrequency Ablation 59 Spinal Fluid 59 Abdomen 59 Test Detects 59 PET Scanner 59 Computed tomography 59 transrectal 59 retroperitoneal 59 Grafts 59 Left Ventricular 59 Cancer Diagnosis 59 Bypass Surgery 59 Myocardial Ischemia 59 fine needle aspirate 59 Radiation Dose 58 endoscopic retrograde cholangiopancreatography ERCGrant Parpan 58 Breast Tumors 58 leiomyomas 58 transrectal ultrasound guided 58 Tonometry 58 guided percutaneous 58 sonographically guided 58 lumbar discectomy 58 Autologous 58 Angiography 58 Lung Tumors 58 Intracardiac 58 Incision 58 Abdominoplasty 58 Prostate Cancer Surgery 58 arthrography 58 Breast Reconstruction 58 pulmonary angiography 58 Breast Biopsies 58 Laparoscopic 58 Non Invasive 58 Computerized Tomography 58 upper endoscopy 58 Intracranial 58 stereotactic biopsy 58 Lipolysis 58 Tonsillectomy 58 Nodules 58 Metastatic Prostate Cancer 58 Prostate Cancer Diagnosis 58 Skin Lesions 58 Carotid artery 58 Cryoablation 58 Noninvasive 58 Lymph Node 58 Allografts 58 needle biopsies 58 surgical excision 58 Skin Grafts 58 thyroidectomy 58 Transcatheter 58 Computed Tomographic 58 Rectal Cancer 58 Total Knee Arthroplasty 58 Tickle Lipo 58 Tracheotomy 58 Cancer Recurrence 58 immunohistochemical analysis 58 Malignancy 58 Stenosis 58 Bladder Cancer 58 Breast Specific Gamma 58 Detect Breast Cancer 58 transthoracic 58 Minimally Invasive Procedure 58 Prognostic Value 58 Tumor Growth 58 Lymph Nodes 58 Ovarian Tissue 58 Carotid 57 thyroid nodules 57 Detect Cancer 57 computed tomography scans 57 pathologic examination 57 Liver Metastases 57 CT Colonography 57 Parathyroid 57 Carcinoma 57 coronary angiogram 57 Malformations 57 Spinal Fusion 57 Prostate Cancer Recurrence 57 Cervical Spine 57 Sentinel lymph node 57 colonography 57 Pleural 57 Biopsy System 57 Breast Cancer Patients 57 Ablation 57 Dilatation 57 endoscopic retrograde 57 Total Knee Replacement 57 pelvic ultrasound 57 transvaginal sonography 57 prostate biopsy 57 Radiographs 57 Breast Cancer Recurrence 57 Cryosurgery 57 Excimer Laser 57 Calcified 57 vein ablation 57 Carcinomas 57 Improves Outcomes 57 3T MRI 57 Non Invasive Treatment 57 Quantitation 57 endoscopic ultrasonography 57 Appears Safe 57 Radiographic 57 bone scintigraphy 57 Lung Cancer Patients 57 Vertebral 57 Prostate Specific Antigen 57 Coronary Artery Bypass Graft 57 lung biopsies 57 histological examination 57 Eyelid 57 Intracranial Aneurysms 57 paracentesis 57 CellSearch ™ 57 Nasopharyngeal 57 Uterine 57 Single Photon Emission Computed 57 Polyps 57 transurethral resection 57 Lymphatic 57 Neoplasms 57 CT Scanning 57 Endoscopic ultrasound 57 Multidetector CT 57 SPECT CT imaging 57 myomas 57 Brain Aneurysms 57 TRUS 57 scintigraphy 57 Endovascular Treatment 56 Clinical Relevance 56 lung nodules 56 Osteotomy 56 Excision 56 Surgical Robot 56 Image Guided Surgery 56 Immunohistochemistry 56 Debridement 56 Improve Survival 56 Perfusion 56 Hair Transplantation 56 Electrical Stimulation 56 Pulmonary Artery 56 Minimally Invasive Treatment 56 Colonoscopy 56 Preoperative 56 ductal lavage 56 sentinel node biopsy 56 Catheter Ablation 56 Endometrial 56 Prostate Cancer Screening 56 barium enema 56 Vertebroplasty 56 Immunohistochemical 56 Nonsurgical 56 biopsy specimens 56 Optical Coherence Tomography 56 Diabetic Foot Ulcer 56 Hypertrophy 56 Intra operative 56 adenomatous polyps 56 Echocardiogram 56 Computed Tomography 56 MRI Scans 56 Mitral Valve Repair 56 Valve Replacement 56 Allogeneic 56 positron emission 56 Intramedullary 56 Urethral 56 Left Atrial Appendage 56 liver biopsy 56 Predict Breast Cancer 56 EUS FNA 56 Histological 56 Histology 56 Carotid Stenting 56 Drug Prevents 56 External Beam 56 abdominal ultrasound 56 Gastric Bypass 56 Anterior Segment 56 Adenocarcinoma 56 engineered bladders 56 Knee Replacement Surgery 56 helical CT 56 Radiation Exposure 56 Renal Artery 56 REMINDER ORLive Presents 56 Breast Cancer Detection 56 endoscopic ultrasound 56 Blood Vessels 56 Cancerous 56 Cytogenetic 56 Prostate Surgery 56 Peritoneal 56 Aggressive Prostate Cancer 56 Testicular 56 sacrocolpopexy 56 Hip Replacement Surgery 56 Microvascular 56 Ultrasound 56 sentinel node 56 Autograft 56 Treatment Reduces 56 Third Eye Retroscope 56 Stereotactic Radiosurgery 56 Embolic Protection 56 Myocardial Perfusion Imaging 56 Histologic 56 Hallux 56 Colorectal Cancers 56 lung nodule 56 Pap Smears 56 Could Detect 56 Hernia Repair 56 Papillary 56 Hysterectomy 56 Skeletal Muscle 56 flexible endoscope 55 Surgery 55 Penile 55 surgical biopsies 55 Endothelial 55 Osteoporosis Drugs 55 Liver Tumors 55 Coronary Artery Bypass Surgery 55 EBUS FNA 55 cancerous polyps 55 Pulmonary Function 55 preoperative staging 55 Imaging BSGI 55 endorectal coil 55 computerized tomography scans 55 ovarian malignancy 55 Venous 55 endometrial biopsy 55 FDA Clears 55 Blood Vessel 55 HER2 Positive 55 Disease Progression 55 immunohistochemical 55 minimally invasive laparoscopic 55 transurethral 55 Sonograms 55 Cranial 55 Gastric Cancer 55 Formalin Fixed Paraffin Embedded 55 Inguinal 55 Gallbladder 55 Peripheral Blood 55 CT angiography CTA 55 Humeral 55 Thrombectomy 55 Spinal Fractures 55 PET Scan 55 Stereotactic 55 Protein Expression 55 Aneurysm Repair 55 needle biopsy 55 Immunosuppression 55 Abdominal Wall 55 Renal Cell Carcinoma 55 Laser Assisted 55 Patency 55 Allograft 55 Lung Cancer Survival 55 Blocked Artery 55 Detecting Breast Cancer 55 Adjustable Gastric Banding 55 Improves Survival 55 Cardiac catheterization 55 sentinel lymph node 55 Gamma Imaging BSGI 55 bronchoalveolar lavage 55 pseudoaneurysm 55 Reduces Pain 55 Deep Venous Thrombosis 55 Spinal Disc 55 Fine needle aspiration 55 Lung Transplants 55 Elastography 55 kidney ureter bladder 55 para aortic 55 arteriography 55 NMP# 55 Prostate Cancer Risk 55 Buccal 55 lung biopsy 55 valvuloplasty 55 transrectal ultrasound 55 Tomography SPECT 55 ASCUS 55 Corneal Transplant 55 Soft Tissue 55 Diffusion Weighted 55 malignant growths 55 Endothelium 55 Can Detect 55 hypervascular tumors 55 Neoadjuvant Chemotherapy 55 Confocal 55 Derived Stem Cells 55 fibroadenomas 55 Thrombus 55 Hematopoietic 55 Capsular 55 Transplant Rejection 55 Varicose Veins 55 Thoracoscopic 55 Drug Eluting 55 colon resection 55 Histopathologic 55 Recurrent Prostate Cancer 55 Post Operative 55 Ectopic 55 NearVision CK 55 Prostate Cancers 55 Cholecystectomy 55 bone marrow aspiration 55 F FDG PET 55 Blood Flow 55 MALDI MS 55 ThinPrep R 55 Colon Polyps 55 Unfractionated Heparin 55 Genital Herpes 55 bronchoscopies 55 Positron Emission Tomography 55 excisional 55 colonoscopic 55 Cervical Dysplasia 55 Breast Exams 55 Bone Metastases 55 Laparoscopy 55 Mitral Valve 55 Arteriovenous 55 Situ Hybridization FISH 55 Chronic Sinusitis 55 Surgically 55 Sigmoidoscopy 55 PET CT scans 55 Atherectomy 55 fluoroscopy guided 55 histopathologic examination 55 Myelodysplastic Syndromes 55 Endoscope 55 SPECT Single Photon 55 Squamous Cell 55 D dimer 55 duplex ultrasonography 55 Blood Clots 55 Mammographic 55 Absorbable 55 Ultrasound Imaging 55 Gene Mutation 55 tissue biopsies 55 Oropharyngeal 55 Recurrence 55 Aortic Stenosis 55 Multicenter Trial 55 multislice 55 Helps Identify 55 Forceps 54 Transurethral 54 myocardial revascularization 54 invasive coronary angiography 54 Ovarian Cancer Patients 54 cryotherapy freezing 54 perfusion imaging 54 transvaginal 54 Total Hip Arthroplasty 54 Screening Mammography 54 Coronary CTA 54 Epithelium 54 guaiac 54 Autologous Stem Cell Transplantation 54 Endometrial Cancer 54 Scarless 54 Femoral 54 endoscopic resection 54 Hip Resurfacing 54 Pedicle Screw 54 thyroglobulin 54 urine cytology 54 Tomography 54 Postoperative 54 Metastatic 54 Breast Cancer Treatment 54 CAT Scans 54 Photoacoustic 54 benign lesion 54 Cataract Surgery 54 Detect Lung Cancer 54 preoperative diagnosis 54 Kidney Function 54 Naive Patients 54 Fluorouracil 54 Arthroscopic 54 Intracoronary 54 Basal Cell Carcinoma 54 Treating Chronic 54 Prostatic 54 Mastectomy 54 Articular Cartilage 54 sonographic evaluation 54 Radioimmunotherapy 54 parathyroid 54 TLIF 54 cTnI 54 thoracoscopy 54 endobronchial ultrasound 54 adenomatous 54 Progenitor Cells 54 Androgen Deprivation 54 Adjuvant Chemotherapy 54 Prostate Cancer Patients 54 Colorectal Adenomas 54 Emboli 54 lamellar keratoplasty 54 Fecal Occult Blood 54 CAT Scan 54 color Doppler 54 Paraffin Embedded FFPE 54 Elevated Levels 54 Small Bowel 54 resected 54 tumor excision 54 adrenalectomy 54 nephrectomy 54 abdominal computed tomography 54 pelvic lymph nodes 54 Clinical Outcome 54 Randomized Study 54 gadolinium enhanced 54 Regenerative Cell 54 malignant polyps 54 nephrectomies 54 Arthroscopic Surgery 54 metaplasia 54 Regenerative Cells 54 heterotopic bone 54 Knee Arthritis 54 Prenatal Diagnosis 54 Ultrasonographic 54 Natural Breast Augmentation 54 Spider Veins 54 Computed tomographic 54 seminal vesicle 54 Adjustable Gastric Band 54 Blocked Arteries 54 histological diagnosis 54 ultrasonographic 54 Bone Mineral Density 54 Stomatitis 54 computed tomographic scan 54 aspirates 54 Dural Sealant 54 renal tumors 54 DIEP Flap 54 Single Incision Sling 54 microdissection 54 barium enemas 54 venography 54 Embolic 54 Lower Extremity 54 spiral computed tomography 54 Mantoux 54 Herniated Disc 54 transient elastography 54 transthoracic echocardiography 54 keratectomy 54 cryosurgery freezing 54 Magnetic resonance 54 Inoperable 54 Heart Failure Patients 54 Hemolysis 54 multidetector CT 54 Xoft Axxent 54 Fracture Risk 54 biopsy specimen 54 Lung Cancer Diagnosis 54 Transoral 54 Occlusions 54 Roche cobas 54 Androgen Deprivation Therapy 54 Endothelial Cells 54 Abdominal ultrasound 54 immunochemical 54 Antibiotic Treatment 54 Sclerotherapy 54 Breast MRIs 54 Laser Ablation 54 Percutaneous Tibial Nerve Stimulation 54 resections 54 pathologic diagnosis 54 Bronchial 54 pelvic lymphadenectomy 54 Retinal 54 Antibiotic prophylaxis 54 Viral Load 54 Thrombotic 54 incisional biopsy 54 Histopathological 54 mediastinoscopy 54 Cardiac Function 54 Gum Disease 54 Kyphoplasty 54 T1 weighted images 54 Endoscopes 54 Diabetic Patients 54 submucosal 54 pT2 54 Femtosecond Laser 54 cystoscopy 54 Intra Operative 54 FilterWire EZ Embolic Protection 54 computerized axial tomography 54 radioiodine therapy 54 Magnetic Nanoparticles 54 cholecystectomies 54 cytoreductive surgery 54 Prostate Cancer Detection 54 Leukocyte 54 Vasotrac 54 inguinal hernia repair 54 Fibrin Sealant 54 Brain Metastases 54 histopathologic 54 catheter angiography 54 lymphadenectomy 54 abdominal hysterectomy 54 Tracheal 54 single incision laparoscopic 54 HoLEP 54 IVC filter 54 Tumor Suppressor Gene 54 sentinel nodes 54 Kidney Tumors 54 Stent Thrombosis 54 ileal 54 FDA Okays 54 biopsied tissue 54 Severe Asthma 54 Electrodiagnostic 54 cytological 54 endoluminal 54 osteoid osteoma 54 reaction RT PCR 54 breast biopsies 54 Artificial Disc 54 percutaneous nephrolithotomy 54 total abdominal hysterectomy 53 pneumonectomy 53 Pre Cancerous 53 Diagnostic Tests 53 OnControl 53 enucleation 53 Lithotripsy 53 Metastatic Renal Cell Carcinoma 53 Asymptomatic 53 ELISA assays 53 Fecal occult blood 53 Male Infertility 53 laparotomy 53 Tumor Cells 53 Amniotic Fluid 53 Stem Cell Treatment 53 Vitrectomy 53 Prevent Stroke 53 Uterine Fibroid 53 Robotic Prostatectomy 53 Radiofrequency Ablation RFA 53 Lumbar Interbody Fusion 53 Tumescent 53 artery embolization 53 Bladeless LASIK 53 CIN2 + 53 Lung Cancer Surgery 53 C Reactive Protein 53 Surgery Performed 53 radical cystectomy 53 core needle biopsies 53 Pericardial 53 Histopathology 53 Endometrial Ablation 53 Proves Effective 53 CyberKnife Radiosurgery 53 mammogram ultrasound 53 urothelial carcinoma 53 Knee Osteoarthritis 53 Stereotactic Body Radiation Therapy 53 Angiograms 53 abdominal incisions 53 VisuMax 53 Tibial 53 Prolapse 53 angiography 53 Squamous 53 Lung Cancer Detection 53 laparoscopic partial nephrectomy 53 Holds Promise 53 Urinalysis 53 gauge vitrectomy 53 phakic 53 Vizilite 53 WallFlex Biliary RX 53 endothelial keratoplasty 53 Low Dose 53 ureteroscopy 53 Sinus Surgery 53 Crystallographic 53 Occlusive 53 Endovenous 53 catheterisation 53 colonoscopy sigmoidoscopy 53 B Cell Lymphoma 53 Node Negative 53 percutaneous biopsy 53 Ebstein anomaly 53 Novel Method 53 esophageal carcinoma 53 tonsil tissue 53 VATS lobectomy 53 Cosmetic Procedures 53 ultrasound elastography 53 Stem Cell Procedure 53 transoral 53 orchiectomy 53 prostate TURP 53 Bone Density 53 Posterior 53 Therapeutic Efficacy 53 Adult Stem Cells 53 Cytotoxicity 53 Epidermal Growth Factor Receptor 53 Anterior Cervical 53 Ventricular 53 Pap Smear 53 Skin Tightening 53 Wrinkle Treatment 53 Enzyme Linked 53 morphologic characteristics 53 Catheterization 53 FDG PET CT 53 Genetic Tests 53 colon rectal 53 Bacterial Infection 53 endoscopic retrograde cholangiopancreatography 53 Unresectable 53 Transesophageal 53 transcranial Doppler 53 Anterior 53 Vascular Imaging 53 benign nodules 53 Colorectal 53 Kidney Failure 53 Direct Visualization 53 plain radiographs 53 Body Contouring 53 Watchful Waiting 53 Electrocardiography 53 body contouring procedure 53 Hormone Receptor Positive 53 Breast Cancer Cells 53 BoneScalpel 53 Lymph node 53 Non Surgical 53 Diagnosis 53 Percutaneous 53 Prostate Cancer Progression 53 PAP smear 53 Lymph 53 Malformation 53 MDCT angiography 53 arthrodesis 53 endoscopic 53 Confocal Microscopy 53 adjuvant radiotherapy 53 Lung Cancers 53 bone marrow biopsies 53 colorectal neoplasms 53 x ray angiography 53 fibrocystic 53 Infectivity 53 Recurrent Breast Cancer 53 transesophageal 53 chest radiographs 53 Cardiac Troponin 53 Perforation 53 intramedullary nailing 53 biliary tree 53 Phacoemulsification 53 sympathectomy 53 Lung Function 53 Accelerated Partial Breast Irradiation 53 invasive diagnostic 53 Irregular Heartbeat 53 Acute Myocardial Infarction 53 balloon dilation 53 esophagectomy 53 Mammosite 53 Shows Promising 53 Prognostic Significance 53 Predictive Value 53 superficial femoral 53 Mitral Regurgitation 53 Nano Particles 53 lipomas 53 Bloodstream Infections 53 turbinate 53 Cysts 53 Metastatic Disease 53 computerized tomography CT scan 53 laparoscopies 53 bullous 53 malignant nodules 53 penetrating keratoplasty 53 Mohs surgery 53 radionuclide imaging 53 transitional cell carcinoma 53 Estrogen Therapy 53 Organ Rejection 53 incisional 53 Blood Transfusions 53 Implantations 53 SpyGlass System 53 Incisions 53 Immunohistochemical analysis 53 Hepatocellular 53 Anterior Cruciate Ligament Reconstruction 53 Diagnostic Tools 53 Breast Enlargement 53 hypervascular 53 keloid scarring 53 Capsule Endoscopy 53 noninvasive imaging 53 Cancer Treatments 53 coronary CT angiography 53 Kidney Transplant 53 pars plana vitrectomy 53 Effectively Treats 53 Polyp 53 Brain Tumors 53 Knee Implant 53 bronchoscopy 53 epicardial ablation 53 Atrial 53 Breast Density 53 ischemic mitral regurgitation 53 Ischemic Stroke 53 sonographically 53 intraductal 53 Invasive Breast Cancer 53 Help Detect 53 Cognitive Function 53 Breast Enhancement 53 MammoSite Radiation Therapy 53 Urodynamics 53 ultrasonographic examination 53 Calcification 53 Help Diagnose 53 Antitumor Activity 53 Mutation Detection 53 sonographic guidance 53 gallbladder removal 53 Colorectal Screening 53 Lesions 53 atrial ablation 53 antrum 53 Slow Progression 53 pathologic correlation 53 postoperative morbidity 53 Breast Cancer Metastasis 53 Pelvic Organ Prolapse 53 SilverHawk Plaque Excision System 53 renal cell carcinomas 53 TKAs 53 Color Doppler 52 micrometastasis 52 Immune Cells 52 Skin Cancers 52 hilar 52 Benign Prostatic Hyperplasia BPH 52 breast carcinomas 52 CT angiogram 52 video assisted thoracoscopic 52 Imaging Technique 52 Potent Anti 52 Dissections 52 Ulnar 52 balloon valvuloplasty 52 Septic Shock 52 endomicroscopy 52 Cytology 52 Radio Frequency Ablation 52 esophagogastroduodenoscopy 52 Face Transplant 52 polypectomy 52 Anastomosis 52 Cellulite Treatment 52 thrombus aspiration 52 Aneurysm 52 Restenosis 52 Macroscopic 52 Precancerous 52 lumbar disc herniation 52 debulking 52 Tissue Engineered 52 RT qPCR 52 Positron emission 52 Patients Receiving 52 Migraine Headaches 52 Stomach Ulcer 52 Fluoroscopy 52 paragangliomas 52 Who Underwent 52 Nodule 52 intraoperatively 52 Renal Function 52 Transfusions 52 Gel Electrophoresis 52 Molecular Breast 52 IntraLase laser 52 Diffusion weighted 52 Urine Test 52 Dose Reduction 52 Nearsightedness 52 Urinary Catheter 52 haematuria 52 trabeculectomy 52 Dosimetry 52 Blood Stem Cells 52 Kidney Transplant Patients 52 Tumor Response 52 Abnormality 52 Nitinol Stent 52 Skin Regeneration 52 parathyroidectomy 52 Dilation 52 enteroscopy 52 Prolonged Survival 52 Cytyc ThinPrep 52 tear osmolarity 52 Image Guided 52 NOTES Natural Orifice 52 Progenitor Cell 52 Pulse Oximetry 52 Statin Therapy 52 LightCycler ® 52 Monoclonal 52 Situ Hybridization 52 interstitial brachytherapy 52 Surgical Procedures 52 Deformity 52 renal artery stenosis 52 Soft Tissue Sarcoma 52 osteoma 52 Varicose Vein 52 Obese Patients 52 Western blotting 52 Intensity Modulated 52 Roche LightCycler ® 52 calcaneal fractures 52 Hysterectomies 52 bone marrow biopsy 52 Ovarian 52 coil embolization 52 scleral buckling 52 metastatic malignant 52 Nanoprobe 52 Breast Ultrasound 52 laparoscopic cholecystectomy 52 Clinical Validation 52 Could Predict 52 nodal dissection 52 Echocardiographic 52 Urinary Incontinence 52 computerized tomography scan 52 ECG gated 52 #mTc 52 FDG PET 52 microkeratome 52 malignant ovarian 52 Breast Implant 52 Hypertrophic 52 Microalbuminuria 52 First Trimester 52 Fluorescein 52 positron emission tomography computed 52 duodenal 52 Helps Diagnose 52 cystectomy 52 cystoscope 52 Breast Implants 52 Cyst 52 intracavitary 52 Breast Surgery 52 laryngoscopy 52 precancerous polyp